Grease gun



Dec. l2, 1933.

C. G. BUTLER GREASE GUN Filed Feb. 20, 1933 IHI m MM.

Patented Dec. 12,v 1933 UNITED STATES PATENT Y OFFICE i GREASE GUN YClyde G. Butler, Cincinnati, Ohio, assignor to The Cincinnati BallCrankV Company, Cincinnati, Ohio, a-corporation of Ohio ApplicationFebruary 20,1933. Serial No. 657,563

zo claims. (c1. zei-47.4)

Thisv invention relates to a lubricating device of the character knownto the trade as a hand type pressuregrease gun.

Conventionally, guns of this type combine a grease supply chamber `and agrease ejecting chamber having a discharge end for interchangeablyconnecting to a so-called lancev extension, or a flexible conduit,"whichcoupling members extend the reach of the gun for application to the l@respective fittings projecting from the part of the structure to belubricated.

In many old type hand guns of this class, the `grease discharge chamberis either parallel to or angularly disposed in relation to the casingconl5 stituting the grease supply chamber which makes a unit diiculttoholdV upon a fitting during manual operation. In other old guns of thisgeneral type, it is impossible'to easily apply ther nozzle directly to afitting o1' Vto hold it to aiitting securely while ejecting a charge ofgrease under-high pressure. l l

In addition to these disadvantages, it is a common fault of the ordinarycommercial hand gun that the difficulty of holding the gun properly tothe fitting is increased from the fact that physical force is requiredto eject a charge' and, that the gun structure is so organized that ftheapplication of that hand force is exerted in a general direction awayfrom or laterally relative to the fitting, thus tending to displace thegun in relation to the fitting whenever it is operated.

It is common experience that hand guns of this type requiring vrelativemovement oi the casing body and the actuating lever in a shearlikemanner', which produces-a wabbling, rendering it difficult to hold thegun steady when applied to the fitting or in permanent contact with thefitting.

This invention is intended to provide a practical solutionto these andother familiar problems inherent in the use of hand operated grease gunsnow in common usage. Y

This concept, in its larger aspect, comprises the formation of a casingresembling a gun barrel, lsomething that Acan be, as it were, aimed atthe target or fitting and which is so organized as to be capable ofbeing directly supported thereon, so that the body pressure, plus thevmanual force of operating the ejecting mechan ism, shall exert acomponent force tending to .increase the contact of the nozzle with thefitting vand to steady the gun when inV operation. To this end I providea longitudinal,` preferably separable or two-part casing, the members ofwhich are coupled together, both providing a grease sign application ledconcurrently herewith.

supply or low pressure chamber at one end and aself-contained highpressure grease chamber and ejecting mechanism at the other end, theforward end being provided with a fixed or rigid nozzle for directcontact with a fitting and the 50 ejecting mechanism being operated by alever projecting from a medial yportion of the casing and movable in thegeneral direction of the flow of grease to eject the charge into thefitting. From this disclosure it will be obvious that all the factors ofbody pressureand operating force are directed to and compounded upon thefitting to which the gun structure is applied.

One of the numerous advantages of this concept is, that it permits of awide choice of casing design,V depending on the artistic resources orthe individual taste of the maker, and the Voriginal designcharacteristic of the casing herein disclosed forms the subject matterof a de- Preferably, I employ a high pressure grease chamber embodying alongitudinally reciprocating ejecting piston with the operatingmechanism disposed interiorly of the casing. This arrangement permits ofthe placing of a fulcrum for an actuating lever within a medial portionof the casing in more or less approximate alignment between the butt endof the gun and the rigid nozzle and vto provide that this lever shall bemovable in the same general direction as the movement ofthe pistontoward the discharge end of the gun. The law of this structure andorganization is particularly useful in that it enables the coordinationof the different body members which come'into play when a fitting is tobe lubricated 90 with this sort of gun. That is to say, Vthe gun may beheld to the shoulder as an ordinary shot gun soa-s to bring the bodypressure on the gun directly in the line of the fitting, While at thesame time the operating handl pushes the ejecting `lever toward 4insteadof away from the fitting.

'Moreoven this improved gun has the distinct advantage that, due to thedirection of operation of the lever and the fact that the greasedischarging pressure is exerted in line with the application pressure tohold the gun on the fitting, the gun can be operated with one hand, theshoulder or hip being against the rear end of the gun for locating it onthe fitting. Therefore, the other hand is free for other uses, such asoperating a shaker bar to loosen the springs or partsA being lubricated.v

In addition to this, the lever is arranged rela.- tive to the gun barrelso that when retracted, it

nes fairly close to the barrel and is heidv in this l position becauseof the grease feeding pressure which is then effective against the headend of the discharge piston.

Other features of the invention will be more fully set forth in adescription of the accompanying drawings, in which:

Figure 1 is a longitudinal sectional view of the improved hand operatedgrease gun.

Figure 2 is an enlarged View of the forward head or pressure unit of thegun, showing the operating lever and piston moved forwardly in.a

lrel forming a grease supply or relatively low pressure chamber 5, ahead including a supporting .randg-rease flow casing-.6 carrying agrease discharge or relatively highpressure cylinder 'I andfpiston 8-and a discharge tube or lance 9 for -butting engagement with theconventional butt type fitting (not shown) The pressure head unit andthebarrel have-screw-threaded connection, the barrel b eing vscrewedinto `the head and the general relation of these major partsbeingcoaxial or aligned so that the general casing arrangement is long andslim for convenient manipulation intolthose close quarterssometimes'found Vin obtaining access to lubrication fittings ofautomobiles. The pressure head or casing is tapered .to the forward endfor further conveniencev in application to fittings.

Within the 4supply chamber, a grease forcing Amechanism is fprovided. Inthis-particular case, .according to the illustration, this grease supply,or forcingJ means consists of a lfolloweriplate or piston-10 fittingwithin the barrel andoperating en -.an axially disposed retraction rod11, the rod including a--stop 12.0nrits forward end provided .byscrewing 4a. Vnut thereon and includes a brace or stock-13 on itsrearwardly exteriorly extended end. Thefstock inaddition tothe provisionof a pad forthe application of body pressure longitudinally-fof the gun,is formed for convenient manipulatiomrthat is, provides an-opening 14 sothat lthefingers may be 4slipped through and a convenient grip obtainedfor retraction of the rod .and piston or follower` plate during loadingor filling operations. Y

The rear end of the barrel is closed by means of a cylinderl head or capl5 screwed thereon,

`providingaslide `bearingfor the retraction rod.

Afpaokingjgland-lis screwed into the cap providingfa sealed, sliding tfor the rod. The stock orbrace is rigidly .fixed on the router en dofthe rodandincludesascrew-threaded forward shank 17 adapted to-bescrewedinto Aai,screw-threaded bore .in .the VVpacking gland forv the ,purposeof fastening :the retractionrod in plunged or forwardly movedpositionafter the gun hasbeen loaded.

Inv this particular case, air, as an actuating means,- is supplied underpressure in back of the -followeruplate forfforcing the same against thebody of grease, the air being introduced through .a conventional;valvednipple `or stem 18 screwed intoV the rear fhead. The head also `includesa ,reliefvalve 19 :for exhausting the vairfromthe barrel when it isdesired to retract the piston. A spacer sleeve 20 is mounted on the rodto limit rearward retractive movement of the piston to prevent theoperator from drawing the follower plate against the rear head.

The follower plate assembly is as follows: A pair of reversely facingcup gaskets 21 are butted together. A cup-shaped spring element 22including spring flanges for holding the flanges of the gaskets againstthe barrel inner surface are provided, one in each gasket. Washers 23lie against the respective sides of this assembly and the assembly isheld together by means of hub elements screwed together, includingfianges abutting the respective sides of the aforesaid assembly.

More specically, the hub elements include an intermediate sleeve 24screw-threaded on both ends externally and fitted on the retraction rod,a flanged nut 25 screwed on one end of the intermediate element andlying against one washer and a sleeve 26 screwed on the opposite end,lying against tho other washer and haVingasliding t on the retractionrod.

' Two devices are provided for preventing leakage of grease past thefollower plate along the surface of the retraction rod. A spring-urged,cone-shaped packing v element 27 is contained within an interna-lcounterbore of theinterrnediate element and engages,v against acone-shaped packing 28 lying against'the yinnerend of ya counter bore29in the sleeve element for forcing this cone-shaped packing upon the rod.The other devicev is contained within the sleeve element r26 within acounterbore inv its outer end. and consiste of a flanged packing ring 31held against the inner end of the counterbore and about the rod by meansof a gland 32 screwed into the counterbore and overlying the ring.

The retraction rod is conveniently withdrawn by the operator by graspingthe manipulating land pressure applying element land unscrewing thesaine from its rearvconnection. The forward vhead is first unscrewed andAthereuponfthe forward'end of the barrel is plunged in the grease `bulkand -the retraction -rod drawn back, drawing the follower plate againstthe spacer sleeve and sucking the barrel full-of grease. Thereafterthe'rodll is shoved forwardly, screwed-back into vpositiomthe head isscrewed' onto .thebarreL and a supply of air under pressure isintroduced into the barrel in back of tlie'follower plate, thegun thenbeingfoperative for supplying a constantflow of greaseinto the pressurehead.

The head of the gun is generallyhollow. 'Its casing 6 is formed'toprovide agrease'flow passageway 33 at one side of .theaxis thereof 'butwithin the region dened by the circle or circumference of the barrel.The conduit portion of the casing thus provided being disposed to oneside, provides a clearance space'34ifor mounting of the operating leverfor the grease :discharge :piston 8 onlthe casingvandattachment 4to thepiston. The piston 8 is mounted across this clearancespace and hasaibearing inthe headfat both ends. The cylinder 7 is screwed into thehead from the forward end and supports the forward end of'the piston.

The axial relation of the grease forcing piston 8 and cylinder relativeto the barrel is slightly offset for -manufacturing purposes. This dis-4alignrneritis not to any greatdegree and the high pressure piston andcylinder `being :contained withinthe area bounded yby anvextended'circumference ofthe barrel.

For the purpose of operating the grease discharge piston, a lever 35 is.provided extending laterally from the head. For the purpose of mountingthis lever, spaced ribs 36 extend across the clearance space 34, one ateach side of the high .pressure piston, and the lever is pivoted upon a.pin 37 fixed across the space between the ribs and between the pistonand the supply passageway. o V

The forward or attached end of the lever is bifurcated, therebystraddling the piston. Adjacent the pivot connection of the lever thepiston is annularly grooved as at 38. This groove may be provided asshown by making the piston in two pieces, 39, 40, the rear sectionincluding a counterturned shank 41 extending into the head rear end ofthe forward section and pinned thereto, the respective heads beingspaced to provide the annular groove. y

The lever is flexibly connected to the piston through this groove. Forthis purpose a pair of trunnion blocks 42, one at each side of thepiston and lying within the groove at the respective sides are rotatablymounted on the respective arms 43 of the bifurcated lever on pins fixedin the arms.

The lever is of suiiicient length to give extremely great leverage andsince thel lever pivot point and connection to the piston are extremelyclose, the leverage produces an extremely eiective discharge pressure.VThe ejecting movement of the piston is forwardly since the pivot isabove the piston. that the high pressure grease ejecting movement of thepiston produced by moving the lever forwardly compounds the forceapplied against the butt type fitting through the application of bodypressure on the shoulder brace or butt at the rear end of the gun.

The lever for operating the piston is curved rearwardly so as to lierelatively close to the gun barrel when retracted and is normally heldin this position automatically by the supplypressure on the greaseexerted against Vthe journal end of the piston.

The grease discharge cylinder, as stated before, is screwed into theforward end of the high pressure head. Its extreme inner end iscounterturned as at 44 to t within a small bore portion of the head. Asecond counterturned portion is provided which is screw-threaded into ascrewthreaded bore portion 45, the shoulder 46 be-A tween thecounterturned portions engaging against a packing ring 47 lying againstthe adjacent shoulder of the head. This cylinder element is screwed intoposition against a shoulder 48 constituted by a nut portion 49exteriorly of the head.

The supply passageway 33 extending to the forward end of the head turnsinwardly at the outer end vof the head and communicates with an annulargroove 50 in the cylinder element, radial passageways or ports 51connecting the annular groove with the cylinder bore. The piston infully retracted position is drawn past these ports so that the grease isfree to enter the cylinder in front of the piston after each retractionstroke. The discharge tube or lance 9 is shown as of Ythe rigid typeconsisting of a tube having a. butt head 52 concave on its outer end fora sealing fit with the tipof a lubricating tting of the butt type. Thistube is secured to the gun assembly speciiicallyvto the cylinderrelement by means of a coupling element 5,3'. The coupling element isscrewed into an internal bore of the This is distinctly advantageous inYcylinder and includes a nut portion for manipulation thereof. Its innerend engages a packing ring 54 and the packing ring 54 lies againstaYvalve seating ring or washer 55 lying against an internal shoulder ofthe cylinder element between the coupling receiving .bore andthe maincylinder bore. Y

A ball valve 56 is provided mounted in a chamber of the coupling andurged by means of a coil spring' 57 under` compression within acounterbore, against a tapered seat formed on the outer side of theValve seating washer 55. The ball extends through the washer a suincientamount to be unseated by the piston at each forward or discharge strokeby direct contact, the piston being limited in forward movement byengagement with the washer, the bore of which is of smaller diameterthan the bore of the cylinder. The discharge tube or lance includes arear head 58 which is screwed over an extended nipple of the couplingelement and which includes an.

annular shoulder'59 fitting into a counterbored portion ofthe couplingelement against a cupshaped packing 60 spring-urged outwardly againstthe annular shoulder.

The discharge tube or lance may be replaced by flexible hose and acoupling on theend of the hose for locking attachment to pin typettings. When the rigid or xed lance or discharge tube is engaged againstthe fitting, thepressures applied to the gun by the operator are jointlydirected in substantial alignment throughout the gun and are compoundedfor obtaining a positive sealing engagement in direct line and underYconsiderable application pressure. The forces applied in the manualoperation of the gun are all within the small diameter of the gun sinceall parts vthrough which pressure is applied lie within the circle ofthe gun. This eliminates any tendency to tilt or cant the gun under theejecting forces.

Having described my invention, I claim:

LA grease gun, having a longitudinally continuous barrel-like greasecasing terminating in a rigid fitting engaging nozzle, said casing beingof relatively large diameter at the butt end providing a grease supplychamber, and of relatively reduced diameter at the nozzle end providinga grease discharge chamber supplied with grease from the supply chamber,said supply and discharge chambers being disposed in longitudinalalignment, an independent grease ejecting mechanism entirely containedwithin the grease discharge chamber casing, and a member on the casingin the rear of the nozzle for manually actuating saidv mechanismindependently of gun application to the fitting. y

2.'A' grease gun, having a longitudinally continuous barrel-like greasecasing rigid from end to end, said casing being of relatively largediameter at the butt end providing a low pressure grease chamber, and ofrelatively reduced diameter at the muzzle end providing an elongatedhigh pressure grease chamber supplied with grease from the low pressurechamber, said supply and discharge chambers being disposed inlongitudinal alignment an independent grease ejecting mechanism in thehigh ypressure chamber, and a lever having a handle portion projectinglaterally from an intermediate portion of the casing for manuallyactuating said mechanism, the projecting handle portion of saidactuating lever being movable in the general direction of the movementof the grease to eject a charge inta a-iitting. i

.3.A A grease gun having a unitary casing, one

, mechanism self-contained within the portion of whichisiof relativelylarge diameter providingva low pressuregrease chamber, the otherportionf of which is of-y relatively'reduced diameter forming an axiallycommunicating continuation of v*the larger portion of the casingproviding a high pressure grease chamber forming a continuation of andcommunicating with the low pressure chamber, means entirelyself-contained` within the" high pressure chamber' for ejecting a chargeof grease, and an actuating lever fulcrume'dV in the casing and having ahandle portionprojecting laterally from an intermediate portion of thecasing manually operable for ejectinga'charge of grease under highpressure, said lever connected with the high pressure means in`termediate ofthe fulcrum-and handle portions of the lever.

4'. A grease gun, comprising, a `unitary casing having a large portionand a reduced portion forming an axially communicating continuationthereof, areciprocating piston and operating smaller portion off thecasing constituting av high pressure ejecting means, and a manuallyoperating member projecting laterally from an intermediate portion ofthe casing for loperating the ejecting mechanism when said member ismoved in the general direction toward the muzzle end of the gun.

5. A grease gun, having a unitary casing rigid from end to end providinga butt end and a` rigid fitting engaging nozzle, one portion of whichcasing is of large diameter and the other portion of which is ofrelatively smalldiameter, said casing sections providing end abuttingand communicating low pressure and high pressure grease chambers, theaxis of the high pressure chamber.

being slightly offset in relation to the axis of the low pressurechamber but disposed within a rnedial portion of the circumference ofthe larger or low pressure chamber, means for constantly exertingpressure on the grease in the low pressureV chamber, ejecting meansself-contained within the high pressure chamber, and an independentmanually operating lever for' said ejecting means intermediate ofthelength of the casing` for ejecting a shot of grease under high pressure.

6. A grease gun, comprising, a barrel-like casing having abutt-positioning member at one end and a fixed iitting engagementvejection nozzle at the other end, lsaid casing being longitudinallysubdivided into'an organized low pressure grease chamber and anorganized and a communicating high pressure grease chamber, aself-contained mechanically operated grease ejector therein, andl amanually operated actuating member projecting throughan intermediateportion of the casling operatively connected with the high pressureejection mechanism.

7. A grease gun, comprising, a barrel-like casing having abutt-positioning member at one end and a fixed fitting engagementejection nozzle rat the other end, said casing being longitudinallysubdivided into an organized low pressure grease chamber and anorganized and-communicating high `pressure grease chamber, aself-contained mechanically operated grease ejector therein, a manuallyoperatedV actuating member projecting through an'intermedate portion ofthe casing operativelyv connected with the high pressure ejectionmechanism, and means rendering said -mechanism active to discharge ashot of grease when said-manuali member s pushed in the generaldirection of the fitting and inactive on the return stroke;

8.1A lubricant supply gun, comprising, a-barrel having a stock at itsrear 'end for application of pressure longitudinally of the barrel and-abuttv type nozzle at its forward end'adapted to engage a butt typefitting, said barrelfincluding a lubricant forcing means therein urgingthe lubricant to the forward end of the barrel, a high pressure cylinderat the forward end of the gun/contained within the'circumference of thebarrel and in alignment with the nozzle, said cylinder receiving thelubricant, a high pressure piston operable insaid cylinder, and amanually operated pistoni reciprocating device locatedexteriorly ofthegun. 9. Argrease gun, comprising, a barrel including a pressure applyingelement' at its rear end and a butt type nozzle at its forward endArigidly fixed to the barrel, follower plate mechanismfor urging thegrease forwardly in the barrel, ahigh pressure `cylinder receiving thevgrease 'andf disposed within the circumference ofthe barrelfan'd' inalignment therewith, and a manually operable lever extendedr laterallyfrom thel cylinder, said,V lever mounted relative to the cylinder andconnected to the piston whereby the piston is operated in its forward ordischarge stroke by forward movement of the lever. f

10. A grease gun, comprising, abarrel including a pressure applyingmeans atits rearl end`105 and a'rigidly fixed butt type nozzle at itsforward end, a high pressure cylinderr disposed within the circumferenceof the barrel and sub-r stantially coaxial therewith, means for forcingthe grease forwardly inthe barrel into the cylinder, a high pressurepistonl in said cylinder, a lever for actuating said piston pivoted tothe cylinder approximately on the axial line orhv the barrel and havingoperative connection to the piston, the manipulating end of' said leverextending laterally away from the barrel and the connection to thepiston being disposedwhereby forward strokes of the lever cause forwarddischarge strokes of the piston.

11. In a hand operated grease gun, an elongated casing structureincludingv a discharge chamber and a grease-supply chamber incommunication with thel discharge chamber, a butt at the rear of thecasing, a'nozzle at the forward end of the casing longitudinal of and inline' with 125 the casing, a discharge piston in theV discharge chamber'operating directly toward the nozzle, and a lever'laterally extendedexteriorly of the casing for operating said piston.

12. A grease gun comprising two sectional casings separably unitedlongitudinally, said casings constituting'a grease supply chamber formedwith a body positioning member and a high pressure grease chamber formedwith a rigid fitting engaging ejection nozzle, adapting the unitary 135casing structure to be supported directly upon al fitting, a greaseejecting mechanism self-con'- tained within the high pressure chamber,and an external laterally extended actuating member inrear of the iixednozzle movable iii-relation to-140 the casing for ejecting a charge ofgrease.'

13. A grease gun, comprising, a longitudinal gun-barrel-iike casinghaving' a rigid'fitting engaging discharge nozzie adapted to beAsupported directly on a fitting at its forward end and a butt 145positioning member at itsv rear end, said'casingv comprising a supplychamber communicating with a high pressure chamber, a grease ejectingmechanism interior of the high pressure chamber in rear ofthe fixednozzle and an exterior- 150 ally and laterally extended actuator movablein relation to the casing in the general direction of the nozzle forejecting a charge of grease.

14. A hand-operated grease gun, comprising, a supply barrel, anextended'hollow head for said barrel including a passageway incommunication with the barrel extending forwardly through the head atone side of the axis of said barrel but within the region bounded by thecircumference thereof, a pressure cylinder, a piston in said cylinder,said cylinder and piston mounted in the head and having their axesparallel with the axis of the barrel and within the region dened by thecircumference thereof, said cylinder 1ncluding an annular groove in itsoutersurface in communication with the supply passageway of the head,and radial ports connecting the annular groove with the bore of thecylinder, a Valve mounted in the cylin er opening to discharge ofgrease, and a lever pivotally mounted in the casing between the axis ofthe piston and the supply passageway and extended laterally from thehead, said lever having a flexible operative connection to the piston.

15. A hand-operated grease gun, comprising, a supply barrel, an extendedhollow head'for said i barrel including a passageway in communicationWith the barrel extending forwardly through the head at one side of theaxis of said barrel but Within the region bounded oy the circumferencethereof, a pressure cylinder receiving grease from said passageway, apiston in said cylinder, said cylinder and piston mounted in the headand having their axes parallel with the axis of the barrel and withinthe region dened by the circumference thereof, a valve mounted in thecylinder opening to discharge of grease, and a lever pivotally mountedin the casing between the axis of the piston and the supply passagewayand extended laterally from the head, said lever having a flexibleoperative connection to the piston.

16. A hand-operatedgrease gun, comprising, a supply barrel, an extendedhollow head for said barrel including a passageway in communication withthe barrel extending forwardly through the head, a pressure cylinder, apiston in said cylinder, said cylinder receiving grease from saidpassageway when the piston is drawn back, said cylinder and pistonmounted in the head and having their axes parallel with the axis of thebarrel within the region defined by the circumference thereof, and arearwardly curved lever pivotally mounted in the casing between the axisof the piston and the supply passageway and extended laterally from thehead, said lever having a flexible operative connection to the piston.

17. In a hand operated grease gun, a casing structure providing a greasesupply chamber and a grease discharge chamber in communication with thesupply chamber, a brace at therear end of the casing structure forapplying body pressure longitudinally of thefcasing structure, a rigidtting engaging discharge nozzle extended from the forward end of thecasing structureV and adapted for engagement with a fitting, a greasedischarge piston and cylinder in the discharge chamber disposedlengthwise of the casing structure, andv a lever for operating saidpiston, said lever extending exteriorly of the casing structure andadapted to be swung lengthwise of the casing structure.

18. A hand operated grease gun, comprising, a 'grease supply barrelincluding a low pressure grease forcing means therein, a rear closure onsaid barrel, a head on Said barrel, said head including a grease owpassageway extending from the supply barrel to the forward end of thehead, a discharge nozzle extended rigidly from the head and adapted tosupply grease to a fitting, a discharge cylinder supplied from saidgrease ow passageway, a discharge piston in said cylinder adapted toeject grease through said nozzle under relatively high pressure, saidnozzle, discharge cylinder, and piston disposed longitudinally of thebarrel structure and within the circumferential lines thereof, a leverpivoted in the head and having a flexible connection to the piston, saidlever extending laterally from the head and adapted to be swung towardand from the nozzle, and a brace at the rear end of the barrel forapplying body pressure longitudinally of the gun.

A19. In a hand operated grease gun, an elongated casing structureincluding a discharge chamber, a butt at the rear of the casing, anipple engaging nozzle at the forward end of the casing longitudinallyof and in line with the casing, a discharge piston in the dischargechamber operating directly toward the nozzle, and a lever operativelyconnected to said discharge piston and extended laterally from thecasing and adapted to be swung lengthwise of the casing and generallytoward the nozzle for a discharge stroke of the piston.

2G. A manually operable grease gun having at its forward end a rigidnipple engaging nozzle adapted to engage a fitting, a stock at its rearend in substantial alignment with said nozzle so that pressure appliedupon said stock tends to engage the nozzle with the fitting, a highpressure grease ejecting mechanism for feeding grease through saidnozzle, said gun having a supply passageway extended to said highpressure ejecting mechanism, and a lever operatively connected to saidhigh pressure grease ejecting mechanism and mounted in position inadvance of said stock, said lever so positioned that the operating forceexerted upon it during the working portion of its stroke is appliedsubstantially parallel to the line between the butt and nozzle.

CLYDE G. BUTLER.

